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α.β = 2 ; subtitusi α = 2β
2β² = 2
β² = 1
β = 1 atau -1
saat β = 1 ; maka α = 2
α+β = -(a-1)
2+1 = -a+1
a = -2 (ga cocok, karena a > 0)
saat β = -1 ; maka α = -2
α+β = -(a-1)
-2-1 = -a+1
a = 4 (cocok!)